B010668 - MECHANICAL BEHAVIOUR OF MATERIALS

italian

The course aims at giving the fundamental knowledges for selecting metallic materials for mechanical applications, in order to guarantee the best performance. For this purpose, the relations between mechanical properties and microstructural characteristics are described.

In the course are presented the main notions concerning the structure of metals and their alloys, with particular reference to the mechanical properties

Classroom lectures and exercises

Oral examination.

Material selection in mechanical design
Role of material in design, material property charts, material performance indices and selection procedure

Crystal structures
Metallic crystal systems, crystallographic points, directions and planes, close-packed crystal structures, point defects, plastic strain and slip systems, edge and screw dislocations, Burgers vector, motion of dislocation, energy and stress fields, dislocation multiplication, twinning, grain boundaries

Metal alloys
Solid solutions, phase diagrams, work hardening, strengthening of metals by solid solution, particle hardening, strain aging, oxide dispersion

Creep
Phenomenology, presentation of engineering data, deformation mechanisms, constitutive equations, models of linear viscoelasticity, relaxation, time-temperature parameters

Low cycle fatigue
Cyclic behavior, Manson-Coffin and Basquin relations, high temperature low cycle fatigue, life prediction methods, creep-fatigue interaction, strainrange partitioning

F.Pratesi: Microstruttura e proprietà meccaniche dei materiali. Aracne. ISBN 978-88-548-2163-7
N.E.Dowling: Mechanical Behavior of Materials. Prentice Hall
Ashby M.F.-Materials Selection in Mechanical Design (4ed). Butterworth-Heinemann
G.E.Dieter - Mechanical Metallurgy. McGraw-Hill
L.Vergani: Meccanica dei materiali. McGraw-Hill